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| Title | Pendleton Woolen Mill Land Application Site Ground Water Monitoring Evaluation | |
| Month-Year Published | June 1996 | |
| Online Availability |
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| Short Description |
Ground water and soils samples were collected at the Pendleton Woolen Mill land application site in Washougal, Washington in April and July 1995. A review was also conducted of existing data for biosolids, ground water, soils, and sediment from the adjacent Gibbons Creek remnant channel. (Also see abstract below) | |
| Publication Number | 96-321 | |
| Author(s) | Carey, B. | |
| Print Availability | ||
| Number of pages | 28 pp. + app (65 total) | |
| Keywords | application, biosolids, chromium, creek, evaluation, flow, Ground Water, ground water monitoring, groundwater, metals, monitoring, reporting, runoff, sand, sediment, site investigation, soil, study, water, wells, zinc | |
| Abstract | Long Description |
Ground water and soils samples were collected at the Pendleton Woolen Mill land application site in Washougal, Washington in April and July 1995. A review was also conducted of existing data for biosolids, ground water, soils, and sediment from the adjacent Gibbons Creek remnant channel. Two composite soil metals samples collected at the land application site as part of this study indicated that chromium and zinc concentrations far exceeded background concentrations. These results were also higher than previous results from the same area. Verification sampling is needed. An unsaturated zone monitoring component is recommended to supplement the ground water monitoring network. This system would provide an early warning system and allow prompt adjustments to the land application operation before contamination reaches ground water. An additional downgradient monitoring well is needed in the deeper aquifer to better define the ground water flow direction in the sand and gravel aquifer. Biosolids exceeded the EPA (1993) municipal biosolids criterion for zinc on several occasions since 1994, including during this study. Reporting of biosolids loading to the site has not been required in the permit, nor has it been reported by the facility. This information, especially for zinc and other metals, is needed to update the site life estimate. Further investigation of metals transport to Gibbons Creek remnant channel is needed to determine whether elevated metals concentrations in sediments are related to the land application operation, including transport from the silt zone, surface runoff, airdrift, or the slough draining East Pond. Metals concentrations were below detection in samples from newly installed monitoring wells. |
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